CN114585994A

CN114585994A - Touch substrate, touch module and touch display device

Info

Publication number: CN114585994A
Application number: CN202080000144.0A
Authority: CN
Inventors: 韩文超; 王成国; 孙伟; 高博; 陈明
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Optoelectronics Technology Co Ltd
Priority date: 2020-02-20
Filing date: 2020-02-20
Publication date: 2022-06-03
Also published as: WO2021163966A1

Abstract

The touch substrate comprises a substrate (50) and a touch sensing layer; the touch sensing layer is formed on the substrate (50) and comprises a plurality of touch electrode groups (51) arranged in an array; each touch electrode group (51) comprises a first touch electrode (510) and a second touch electrode which are arranged at intervals along a first direction and are insulated from each other; the first touch electrodes (510) in each touch electrode group (51) are mutually insulated; the second touch electrodes in each touch electrode group (51) comprise sub-electrodes (511) which are arranged at intervals along the second direction and are insulated from each other, and the sub-electrodes (511) of the second touch electrodes in at least two groups of touch electrode groups (51) are correspondingly connected with each other through leads (52); wherein the first direction is perpendicular to the second direction; and the first touch electrode (510), the second touch electrode and the conducting wire (52) are positioned on the same layer. The scheme can realize the whole single-layer wiring, so that the condition of overhigh cost is avoided, and the number of channels can be reduced while multi-point touch control can be identified.

Description

Touch substrate, touch module and touch display device

Technical Field

The embodiment of the disclosure relates to the field of touch technologies, and in particular, to a touch substrate, a touch module and a touch display device.

Background

With the rapid development of display technology, capacitive touch display devices have gradually spread throughout the lives of people. At present, a capacitive touch display device uses a mutual capacitance or self-capacitance principle to detect a touch position, but no matter the capacitive touch display device uses the mutual capacitance or self-capacitance principle to detect the touch position, the existing capacitive touch display device has certain problems, for example: too many channels, poor touch performance, high cost and the like.

Disclosure of Invention

The embodiment of the disclosure provides a touch substrate, a touch module and a touch display device, which have the advantages of few channels, good touch performance, low cost and the like.

In an embodiment of the present disclosure, there is provided a touch substrate including: a substrate and a touch sensing layer disposed on the substrate, wherein,

the touch sensing layer comprises a plurality of touch electrode groups arranged in an array; each touch electrode group comprises a first touch electrode and a second touch electrode which are arranged at intervals along a first direction and are insulated from each other;

the first touch electrodes in each touch electrode group are mutually insulated;

the second touch electrodes in each touch electrode group comprise a plurality of sub-electrodes which are arranged at intervals along a second direction and are insulated from each other, and the sub-electrodes of the second touch electrodes in at least two groups of touch electrode groups are connected in a one-to-one correspondence manner through conducting wires;

wherein the first direction and the second direction are perpendicular to each other; and the first touch electrode, the second touch electrode and the lead are positioned on the same layer.

In an embodiment of the present disclosure, the number of sub-electrodes of the second touch electrode in each touch electrode group is equal to K; k is an integer greater than or equal to 2;

the ith sub-electrodes of the second touch electrodes in at least two groups of touch electrode groups are connected through a lead, i is more than or equal to 1 and less than or equal to K, and i is an integer.

In one embodiment of the present disclosure, in the first direction, the touch electrode groups are provided with M rows; in the second direction, the touch electrode group is provided with N rows; wherein N, M is an integer greater than or equal to 2;

an ith sub-electrode of a second touch electrode in the touch electrode group in the nth row and the mth column is connected with an ith sub-electrode of a second touch electrode in the touch electrode group in the (n + 1) th row and the (m + 1) th column through a lead; wherein N is more than or equal to 1 and less than N, M is more than or equal to 1 and less than M, and N and M are integers.

In an embodiment of the present disclosure, the (n + 1) th row of touch electrode groups is disposed closer to the flexible circuit board than the nth row of touch electrode groups;

in a direction from the nth row to the (n + 1) th row, sizes of the sub-electrodes of the second touch electrode in each touch electrode group in the first direction are sequentially reduced.

the ith sub-electrode of the second touch electrode in the touch electrode group in the nth row and the mth column is connected with the ith sub-electrode of the second touch electrode in the touch electrode group in the (n + 1) th row and the mth column through a lead; wherein N is more than or equal to 1 and less than N, M is more than or equal to 1 and less than or equal to M, and N and M are integers.

in a direction from the nth row to the (n + 1) th row, sizes of the first touch electrodes in the first direction are sequentially reduced.

In one embodiment of the present disclosure, in the first direction, the touch electrode groups are provided with M rows; in the second direction, the touch electrode group is provided with N rows; wherein N is an integer greater than or equal to 2, and M is an integer greater than or equal to 3;

the ith sub-electrode of the second touch electrode in the touch electrode group in the (n + 1) th row and the (m-1) th column, the ith sub-electrode of the second touch electrode in the touch electrode group in the (n) th row and the (m) th column and the ith sub-electrode of the second touch electrode in the touch electrode group in the (n + 1) th row and the (m + 1) th column are connected through a lead; wherein N is more than or equal to 1 and less than N, M is more than or equal to 2 and less than or equal to M-1, and N and M are integers.

In an embodiment of the present disclosure, in the row 1, the i-th sub-electrode of the second touch electrode in the M-1 th column of the touch electrode group is connected to the i-th sub-electrode of the second touch electrode in the M +1 th column of the touch electrode group through a wire, where N is greater than or equal to 3, and M is greater than or equal to 4.

In an embodiment of the present disclosure, in the nth row, the i-th sub-electrode of the second touch electrode in the touch electrode group in the mth column is connected to the i-th sub-electrode of the second touch electrode in the touch electrode group in the M +2 th column by a wire, where N is greater than or equal to 3, and M is greater than or equal to 4.

In an embodiment of the present disclosure, a flexible circuit board is disposed on one side of the touch substrate in the second direction; in each touch electrode group, one end, close to the flexible circuit board, of the sub-electrode, closest to the flexible circuit board, of the second touch electrode is flush with one end, close to the flexible circuit board, of the first touch electrode; one end, far away from the flexible circuit board, of the sub-electrode farthest from the flexible circuit board is flush with one end, far away from the flexible circuit board, of the first touch electrode.

In one embodiment of the present disclosure, in the second direction, a distance between adjacent touch electrode groups is 6 μm to 300 μm;

in the first direction, the distance between the first touch electrode block and the second touch electrode block is 6-300 μm.

In an embodiment of the present disclosure, the first touch electrode and the second touch electrode are both self-capacitance touch electrodes.

In an embodiment of the present disclosure, the first touch electrode is a transmitting electrode, and the second touch electrode is a receiving electrode.

In an embodiment of the present disclosure, a touch module is provided, which includes:

a flexible wiring board having a plurality of pins;

in the touch substrate of any of the above aspects, each of the first touch electrodes is electrically connected to one of the leads through a lead; the plurality of sub-electrodes connected in sequence through the lead are taken as a whole and are electrically connected with the pin through a lead.

In an embodiment of the present disclosure, a touch display device is provided, which includes a display module and the touch module described above, where the touch module is disposed on one side of the display module.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments of the disclosure, and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure and not to limit the disclosure. The above and other features and advantages will become more apparent to those skilled in the art by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which:

fig. 1 is a schematic view of a touch substrate described in the related art;

fig. 2 is a schematic view of a touch substrate according to an embodiment of the disclosure;

FIG. 3 is an enlarged schematic view of section A shown in FIG. 2;

fig. 4 is a schematic view of a touch substrate according to an embodiment of the disclosure under a touch condition;

fig. 5 is a schematic view illustrating a touch substrate according to an embodiment of the disclosure in another touch condition;

fig. 6 is a simplified schematic diagram of a touch substrate according to an embodiment of the disclosure;

fig. 7 is a schematic diagram illustrating a connection between a touch substrate and a flexible circuit board according to an embodiment of the disclosure;

fig. 8 is a simplified schematic diagram of a touch substrate according to another embodiment of the disclosure;

fig. 9 is a schematic diagram illustrating a connection between a second touch electrode and a flexible circuit board in a touch substrate according to another embodiment of the disclosure;

fig. 10 is a simplified schematic diagram of a touch substrate according to yet another embodiment of the disclosure;

fig. 11 is a schematic diagram illustrating connection between a second touch electrode and a flexible circuit board in a touch substrate according to yet another embodiment of the disclosure.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.

In the related art, the touch substrate is usually a self-contained single-layer multi-point structure: the whole surface is divided into P (number of rows) × Q (number of columns) units, as shown in fig. 1, each unit is a touch sensing unit 100, and each touch sensing unit 100 correspondingly represents a channel, so that the design makes the whole surface touch sensing unit 100 have more channels (i.e., P × Q units), which results in more channels and more leads 101, which limits the routing of fan-out (fanout) areas (not shown in the figure), and SLOC (Single Layer On glass) products are not suitable.

As can be seen from the foregoing, the touch substrate provided above has certain problems, such as: too many channels, poor touch performance, high cost and the like.

To solve the foregoing problem, an embodiment of the present disclosure provides a touch substrate, as shown in fig. 2, including a substrate 50 and a touch sensing layer formed on the substrate 50, wherein:

the substrate 50 may be a single layer or a multi-layer structure; optionally, the substrate 50 of the embodiment of the present disclosure has a single-layer structure, so as to reduce the thickness and cost of the touch substrate. It should be understood that the substrate 50 may be selected as an insulating material to prevent the substrate 50 from being electrically connected to the touch sensing layer, so as to ensure normal use of the touch substrate.

The touch sensing layer may include a plurality of touch electrode groups 51 arranged in an array, and specifically, as shown in fig. 2 and 3, each touch electrode group 51 may include first touch electrodes 510 and second touch electrodes arranged at intervals along a first direction (i.e., a row direction) X and insulated from each other, the first touch electrodes 510 in each touch electrode group 51 are a monolithic structure, and the second touch electrodes in each touch electrode group 51 may include a plurality of sub-electrodes 511 arranged at intervals along a second direction (i.e., a column direction) Y and insulated from each other, that is, there is no electrical connection relationship between the first touch electrodes 510 and the sub-electrodes 511, and between the sub-electrodes 511 and the sub-electrodes 511 in each touch electrode group 51. For example, the first touch electrode 510 and the sub-electrode 511 may be rectangular blocks, but are not limited thereto, and may also be regular shapes or irregular shapes as the case may be.

In addition, the first touch electrodes 510 are insulated from each other, that is, there is no electrical connection between the first touch electrodes 510 in each touch electrode group 51. The sub-electrodes 511 of the second touch electrodes in the at least two touch electrode groups 51 are correspondingly connected with each other through the wires 52, that is, the sub-electrodes 511 of the second touch electrodes in the at least two touch electrode groups 51 are electrically connected with each other.

It should be noted that the first touch electrode 510, the second touch electrode 511, and the conductive line 52 in the touch sensing layer may be located in the same layer, that is: the touch substrate of the embodiment can be wired in a single layer on the whole surface. For example, a single patterning process may be used, wherein the single patterning process may include photoresist coating, exposing, developing, etching, and photoresist stripping.

In the embodiment of the present disclosure, the first touch electrodes 510 of each touch electrode group 51 in the touch substrate are insulated from each other, that is: each first touch electrode 510 is equivalent to a channel and electrically connected to a pin of a Flexible Printed Circuit (FPC) via a lead; and the plurality of sub-electrodes 511 electrically connected together by the wires 52 may be integrated as a whole, that is: and the channel is electrically connected with a pin of the flexible circuit board through a lead, so that the number of the channels can be reduced, the number of the leads can be reduced, and the condition that the wiring of the fanout area is limited is relieved.

In addition, since the touch substrate of the embodiment can route the wires in a single layer on the whole surface, the number of layers of the touch substrate can be reduced (i.e. from four layers to two layers), and the punching process can be omitted, so that the process cost can be reduced and the product yield can be improved.

It should be noted that, in the embodiment of the present disclosure, as shown in fig. 4, one first touch electrode 510 corresponds to a plurality of second touch electrodes 511 belonging to different channels; as shown in fig. 5, the sub-electrodes 511 of the same channel respectively correspond to the first touch electrodes 510 of different channels.

Among them, the black dots shown in fig. 4 and 5 may be understood as touch points; each touch point covers three electrodes, the three electrodes are located in the same touch electrode group 51, but belong to different channels, one channel corresponds to the first touch electrode 510, and the other two channels correspond to the sub-electrodes 511, so that capacitance values of the three electrodes can be changed, and the touch position and size can be accurately determined by detecting the change of the capacitance values of the three electrodes. Since the detection of the touch position in this embodiment is usually determined by a first touch electrode 510 and two sub-electrodes 511 which are adjacent and belong to different channels, even if two touch points are relatively close to each other, as shown in fig. 4, the two touch points can be respectively identified because the sub-electrodes 511 corresponding to the two touch points are different; two touch points with a long distance can be identified respectively because the first touch electrodes 510 corresponding to the two touch points are different as shown in fig. 5; namely: the touch substrate of the embodiment can identify multi-point touch without ghost points, so that the touch detection efficiency and accuracy can be improved.

It should be understood that, in order to reduce the design difficulty of the touch substrate, one first touch electrode 510 is provided in each touch electrode group 51 in the embodiments of the present disclosure; one second touch electrode in each touch electrode group 51; the number of the sub-electrodes 511 of the second touch electrode in each touch electrode group 51 is multiple and equal, and is K; k is an integer greater than or equal to 2.

In order to reduce the processing difficulty of the touch sensing layer, optionally, the ith sub-electrode 511 of the second touch electrode in at least two groups of touch electrode groups 51 is connected by a wire 52, wherein i is greater than or equal to 1 and less than or equal to K, and i is an integer; that is, the sub-electrodes 511 at the same position in at least two touch electrode groups 51 are connected to each other through the wires 52.

For example, as shown in fig. 3, K is equal to 4, i may be 1, 2, 3, 4, and in the direction from top to bottom in fig. 3, the 4 sub-electrodes 511 of the second touch electrode in each touch electrode group 51 may be respectively defined as a 1 st sub-electrode, a 2 nd sub-electrode, and a 2 nd sub-electrode; the connection between the sub-electrodes 511 at the same position in the at least two touch electrode groups 51 through the wires 52 can be understood as: the 1 st sub-electrode of the second touch electrode in one touch electrode group 51 is correspondingly connected with the 1 st sub-electrode of the second touch electrode in the other touch electrode group 51 through a lead 52; the 2 nd sub-electrode is correspondingly connected with the 2 nd sub-electrode of the second touch electrode in the other touch electrode group 51 through a lead 52; the 3 rd sub-electrode is correspondingly connected with the 3 rd sub-electrode of the second touch electrode in the other touch electrode group 51 through a lead 52; the 4 th sub-electrode is connected to the 4 th sub-electrode of the second touch electrode in the other touch electrode group 51 through a wire 52.

It should be noted that the number of the sub-electrodes 511 of the second touch electrode in each touch electrode group 51 is not limited to 4 shown in fig. 2 and 3, and may also be 2, 3, or more than 4.

In the embodiment of the present disclosure, as shown in fig. 2, in the row direction X, the touch electrode group 51 may be provided with M rows; in the column direction Y, the touch electrode group 51 is provided with N rows; wherein N, M is an integer greater than or equal to 2.

The touch sensing layer of the touch substrate in different embodiments is described in detail below with reference to the drawings.

For example, in at least one embodiment of the present disclosure, as shown in fig. 2 to 7, the ith sub-electrode 511 of the second touch electrode in the touch electrode group 51 of the nth row and the mth column is connected to the ith sub-electrode 511 of the second touch electrode in the touch electrode group 51 of the (n + 1) th row and the (m + 1) th column by the conducting wire 52; wherein N is more than or equal to 1 and less than N, M is more than or equal to 1 and less than M, and N and M are integers.

Each of the dashed boxes in fig. 6 represents the aforementioned touch electrode group 51; the rectangular block numbered with the beginning of letter F in fig. 6 is the aforementioned first touch electrode 510; the rectangular blocks numbered with the beginning of the letter G in fig. 6 are the aforementioned sub-electrodes 511; as can be seen from fig. 2, 6 and 7, the sub-electrodes 511 (e.g., the sub-electrodes 511 numbered G1, G2, G3 or G4) in fig. 6 can be connected by the wires 52, and the sub-electrodes 511 connected by the wires 52 can be taken as a whole and electrically connected to a lead 55 of the flexible circuit board 54 by a lead 53; in fig. 6, the first touch electrodes 510 with different numbers (e.g., the first touch electrodes 510 with the numbers F1, F2, F10, and F11) and the sub-electrodes 511 with different numbers (e.g., the sub-electrodes 511 with the numbers G1, G2, G3, G4, G5, G6, G7, G8, G41, G42, G43, and G44) are electrically connected to a pin 55 of the flexible circuit board 54 through a lead 53.

In the present embodiment, as can be seen from the numbering shown in fig. 6, when N is equal to 9, M is equal to 8, and each touch electrode group 51 includes 4 sub-electrodes 511 arranged at intervals in the column direction Y, the number of channels in the present embodiment may be equal to 9 × 8+16 × 4 or 136, that is: each row has 9 first touch electrodes 510, the first touch electrodes 510 are 8 rows in total, that is, 9 × 8, and 72 channels in total; each touch electrode group 51 has 4 sub-electrodes 511, and the sub-electrodes 511 are obliquely wired, and are obliquely 16, so that the number of the sub-electrodes is 16 × 4, and is 64, so that the touch sensing layer in the embodiment has 136 channels in total. In the related art, to realize the multi-touch basically equivalent to the present embodiment, 16 × 36 channels are required, that is: 576 channels.

Based on this, compared with the solutions described in the related arts, the present embodiment can greatly reduce the number of channels while achieving substantially equivalent single-layer multi-point touch, thereby reducing the number of leads and alleviating the problem of limited routing of the fan-out area. In addition, the number of channels is reduced, the processing difficulty and the touch blind area are reduced, multi-point touch is identified, ghost points do not exist, and therefore touch detection efficiency and accuracy can be improved.

It should be noted that the display product generally includes a display area and a driving circuit area (or called as a peripheral circuit area and a peripheral circuit area); the driving circuit area is provided with a driving circuit to output signals; a display structure is arranged in the display area to display a picture; and a lead for transmitting corresponding signals to the display area is arranged between the two areas. In order to increase the area of the display region, the conductive lines between the two regions are designed to be concentrated toward the driving circuit region having a smaller area, so that the conductive lines between the two regions are gathered into a fan-shaped structure, which is generally called a fan-out region. It should be noted that the touch substrate is usually disposed in a display area of a display product.

The (n + 1) th row of touch electrode groups 51 are arranged close to the flexible circuit board 54 compared with the nth row of touch electrode groups 51; in other words, the flexible circuit board 54 may be disposed at a side close to the nth row touch electrode group 51. Alternatively, as shown in fig. 2, in the direction from the nth row to the (n + 1) th row, the sizes of the sub-electrodes 511 of the second touch electrode in each touch electrode group 51 in the row direction X may be sequentially reduced.

Since the distance from the flexible circuit board 54 to the side close to the flexible circuit board 54 is gradually increased, the number of the conducting wires 52 distributed at the position corresponding to the sub-electrode 511 closer to the flexible circuit board 54 in each touch electrode group 51 is gradually increased, as shown in fig. 2, one conducting wire 52 is distributed at the position corresponding to the 1 st sub-electrode in each touch electrode group 51; two leads 52 are distributed at the position corresponding to the 2 nd sub-electrode; three conducting wires 52 are distributed at the positions corresponding to the 3 rd sub-electrode; four conducting wires 52 are distributed at the position corresponding to the fourth sub-electrode; therefore, by designing the size of the sub-electrode 511 close to the flexible circuit board 54 in the row direction X to be smaller than the size of the sub-electrode 511 far from the flexible circuit board 54 in the row direction X, the blind touch area in each touch electrode group 51 can be reduced while ensuring that the leads 52 can effectively realize the connection between the sub-electrodes 511 in different touch electrode groups 51.

However, the size of each sub-electrode 511 in each touch electrode group 51 in the row direction X may also be the same in the direction from the nth row to the (n + 1) th row, wherein, in order to arrange the conductive lines at a certain interval, each sub-electrode 511 in each touch electrode group 51 may be sequentially and properly staggered in the row direction X, and the staggered direction may be determined according to the specific conductive line direction.

For example, in at least one embodiment of the present disclosure, as shown in fig. 8 to 9, the ith sub-electrode 511 of the second touch electrode in the touch electrode group 51 of the nth row and the mth column is connected to the ith sub-electrode 511 of the second touch electrode in the touch electrode group 51 of the (n + 1) th row and the mth column by the wire 52; wherein N is more than or equal to 1 and less than N, M is more than or equal to 1 and less than or equal to M, and N and M are integers.

Each of the dotted line boxes in fig. 8 represents the aforementioned touch electrode group 51; the rectangular block numbered with the beginning of letter F in fig. 8 is the aforementioned first touch electrode 510; the rectangular blocks numbered with the beginning of the letter G in fig. 8 are the aforementioned sub-electrodes 511; referring to fig. 8 and 9, the sub-electrodes 511 (e.g., the sub-electrodes 511 numbered G1, G2, G3, G4) in the same number in fig. 8 can be connected by wires 52 and electrically connected to a pin 55 of the flexible circuit board 54 via a lead 53; the first touch electrodes 510 with different numbers (e.g., the first touch electrodes 510 with numbers F1, F2, F3, F10, F11, and F12) and the sub-electrodes 511 with different numbers (e.g., the first touch electrodes 510 with numbers G1, G2, G3, G4, G5, G6, G7, and G8) are electrically connected to a lead 55 of the flexible circuit board 54 through a lead 53.

In the present embodiment, as can be seen from the numbering shown in fig. 8, when N is equal to 9, M is equal to 8, and each touch electrode group 51 includes 4 sub-electrodes 511 arranged at intervals in the column direction Y, the number of channels in the present embodiment may be equal to 9 × 8+8 × 4 or equal to 104, that is: each row has 9 first touch electrodes 510, the first touch electrodes 510 are 8 rows in total, that is, 9 × 8, and 72 channels in total; each touch electrode group 51 has 4 sub-electrodes 511, and the sub-electrodes 511 are wired in the row direction Y, and each row has 4 lines, and 8 rows, so 8 × 4, and 32 lines, so the touch sensing layer in this embodiment has 104 channels in total. In the related art, to realize the multi-touch basically equivalent to the present embodiment, 16 × 36 channels are required, that is: 576 channels.

The (n + 1) th row of touch electrode groups 51 are arranged close to the flexible circuit board compared with the nth row of touch electrode groups 51; in other words, the flexible circuit board may be disposed at a side close to the nth row touch electrode group 51. Optionally, the size of each first touch electrode 510 in the row direction X may decrease sequentially from the nth row to the (n + 1) th row (i.e., from the top to the bottom in fig. 9); due to the design, the connection between different first touch electrodes 510 and the pins 55 in the flexible circuit board 54 can be effectively realized by the leads 53, and meanwhile, the touch blind area in each row of touch electrode groups can be reduced.

But not limited thereto, the size of each first touch electrode 510 in the row direction X may also be the same from the nth row to the n +1 th row, as the case may be.

For example, in at least one embodiment of the present disclosure, as shown in fig. 10 to 11, the i-th sub-electrode 511 of the second touch electrode in the touch electrode group 51 in the (n + 1) th row and the (m-1) th column, the i-th sub-electrode 511 of the second touch electrode in the touch electrode group 51 in the (n) th row and the (m) th column, and the i-th sub-electrode 511 of the second touch electrode in the touch electrode group 51 in the (n + 1) th row and the (m + 1) th column are connected through the conducting wire 52; wherein N is more than or equal to 1 and less than N, M is more than or equal to 2 and less than or equal to M-1, N and M are integers, and M is an integer more than or equal to 3.

Optionally, in the 1 st row, the i-th sub-electrode 511 of the second touch electrode in the touch electrode group 51 in the m-1 st column is connected to the i-th sub-electrode 511 of the second touch electrode in the touch electrode group 51 in the m +1 st column by a wire 52.

Further, in the nth row, the i-th sub-electrode 511 of the second touch electrode in the touch electrode group 51 in the mth column is connected to the i-th sub-electrode 511 of the second touch electrode in the touch electrode group 51 in the m +2 column through the wire 52.

Each of the dashed boxes in fig. 10 represents the aforementioned touch electrode group 51; the rectangular block numbered with the beginning of letter F in fig. 10 is the aforementioned first touch electrode 510; the rectangular block numbered with the beginning of the letter G in fig. 10 is the aforementioned sub-electrode 511; as described in connection with fig. 11 and 12, the sub-electrodes 511 (e.g., the sub-electrodes 511 numbered G1, G2, G3, … …, G15, or G16) in fig. 10 are connected by wires 52 and electrically connected to a pin 55 of the flexible circuit board 54 via a lead 53; the first touch electrodes 510 with different numbers (e.g., the first touch electrodes 510 with numbers F1, F2, F3, F10, F11, F12, F19, F20, and F21) and the sub-electrodes 511 with different numbers (e.g., the sub-electrodes 511 with numbers G1, G2, G3, … …, G15, and G16) are electrically connected to a lead 66 of the flexible circuit board 54 through a lead 53.

In the present embodiment, as can be seen from the numbering shown in fig. 10, when N is equal to 9, M is equal to 8, and each touch electrode group 51 includes 4 sub-electrodes 511 arranged at intervals in the column direction Y, the number of channels in the present embodiment may be 112, that is: each row has 9 first touch electrodes 510, the first touch electrodes 510 are 8 rows in total, that is, 9 × 8, and 72 channels in total; each touch electrode group 51 has 4 sub-electrodes 511, and the sub-electrodes 511 are laterally connected alternately, and the laterally connected alternately are 8 × 4 in total, that is: 32, the remaining touch electrode groups 51 in the first row and the last row are wired at intervals of 4 × 2 in total, that is: 8, therefore, the touch sensing layer in this embodiment has a total of 112 channels. In the first solution, if the multi-touch is to be implemented in the embodiment with substantially the same number, 16 × 36 channels are required, that is: 576 channels.

Based on this, compared with the related art, the embodiment can greatly reduce the number of channels while realizing the substantially equivalent single-layer multi-point touch, thereby reducing the number of leads and alleviating the problem of limited routing of the fan-out area. In addition, the number of channels is reduced, the processing difficulty and the touch blind area are reduced, multi-point touch is identified, ghost points do not exist, and therefore touch detection efficiency and accuracy can be improved.

In an embodiment of the present disclosure, as shown in fig. 7, 9 and 11, a flexible circuit board 54 is disposed on one side of the touch substrate in the column direction Y; in each touch electrode group 51, one end of the sub-electrode 511 closest to the flexible circuit board 54 in the second touch electrode, which is close to the flexible circuit board 54, is flush with one end of the first touch electrode 510, which is close to the flexible circuit board 54; the end of the sub-electrode 511 farthest from the flexible circuit board 54 away from the flexible circuit board is flush with the end of the first touch electrode 510 away from the flexible circuit board, so that when the touch sensing layer is processed, the size of the gap between the adjacent touch electrode groups 51 in the column direction Y is conveniently controlled, and thus, while the connection of the first touch electrode 510 and the sub-electrode 511 with the pins of the flexible circuit board is ensured, the touch blind area can be reduced, and the touch detection accuracy is improved.

Alternatively, in the column direction Y, the spacing between adjacent touch electrode groups 51 may be 6 μm to 300 μm; in the row direction X, the spacing between the first touch electrode 510 blocks and the sub-electrode 511 blocks may be 6 μm to 300 μm. It should be understood that the size of the spacing between the adjacent touch electrode groups 51 in the column direction Y and the spacing between the first touch electrode 510 blocks and the sub-electrode 511 blocks in the row direction X depends on the specific process requirements.

In an optional embodiment of the present disclosure, the touch substrate may utilize a self-capacitance principle to detect the touch position, and in detail, the first touch electrode 510 and the sub-electrode 511 may be both self-capacitance touch electrodes. When a part of a human body (for example, a finger) does not touch the touch substrate, the capacitance borne by each capacitive touch electrode is a fixed value, when the finger touches the touch substrate, the capacitance borne by the corresponding self-capacitive touch electrode is a fixed value and is superposed with the capacitance of the human body, and the touch position can be judged by detecting the capacitance value change of each capacitive touch electrode by a touch detection chip (which can be an FPC) in a touch time period.

Because human electric capacity can act on whole self-capacitance, can only act on the projection electric capacity in the mutual capacitance for human electric capacity, the touch-control variable quantity that is aroused by the human touch-control base plate can be greater than the touch-control base plate of utilizing mutual capacitance principle to make, consequently can effectively improve the signal-to-noise ratio (SNR) of touch-control for the touch-control base plate of mutual capacitance to improve touch-control performance, if: sensing accuracy, linearity, etc.

The touch substrate is not limited to the touch position detection based on the self-capacitance principle, and may also be based on the mutual capacitance principle. Specifically, when the touch substrate in the embodiment of the present disclosure utilizes the principle of mutual capacitance to detect a touch position, the first touch electrode 510 in the touch sensing layer may be a Transmitting (TX) electrode, the sub-electrode 511 may be a Receiving (RX) electrode, and a capacitance is formed between the first touch electrode 510 and the sub-electrode 511, that is: the first touch electrode 510 and the sub-electrode 511 respectively constitute two poles of a capacitor. When a finger touches the touch substrate, the coupling between the first touch electrode 510 and the sub-electrode 511 near the touch point is affected, thereby changing the capacitance between the first touch electrode 510 and the sub-electrode 511. When the mutual capacitance type touch substrate detects the magnitude of the mutual capacitance, all the first touch electrodes 510 send out excitation signals, and all the sub-electrodes 511 receive the signals, so that the magnitude of the capacitance between all the first touch electrodes 510 and all the sub-electrodes 511 can be obtained, that is: the capacitance of the two-dimensional plane of the whole mutual capacitance type touch substrate is large. And the mutual capacitance type touch substrate calculates the coordinate of each touch point according to the two-dimensional capacitance variation data.

Taking the touch substrate of the first embodiment as an example, the inventor verifies the touch substrate, and in the verification process, the inventor verifies the touch substrate by using the FPC, that is: the FPC is bound with the touch substrate, and the touch substrate bound with the FPC is pasted on an OLED (Organic Light-Emitting Diode) screen, wherein the SNR (signal-to-noise ratio) test result is shown in the following table 1:

TABLE 1

SNR(6mm)	Displaying status	Non-display state
Mutual capacitance	8.18	5.78
Self-contained RX	56.94	48.4
Self-contained TX	61.3	55.77

As can be seen from table 1, when the touch substrate in this embodiment is mutual capacitive touch, the SNR is reduced by about 3dB from the non-display state (OLED screen off) to the display state (OLED screen on); when the touch substrate in this embodiment is RX-capable touch, the SNR is reduced by about 8dB from the non-display state (OLED screen off) to the display state (OLED screen on); when the touch substrate in this embodiment is a self-contained TX touch, the SNR is reduced by about 6dB from the non-display state (OLED screen off) to the display state (OLED screen on).

The structure of the FPC may sequentially include a base layer, a metal wiring layer, an insulating base layer, and a top cover layer, where both the base layer and the top cover layer may include an AD board and a PI (polyimide) film, the AD board is a PVC board, and the main material is polyvinyl chloride; and the base layer and the top cover layer may have a thickness of 27.5 μm; the insulating base material layer can be made of PI material, and the thickness of the insulating base material layer can be 25 micrometers; the thickness of the metal routing layer may be 22 μm.

The structure of the OLED screen can sequentially comprise a substrate base plate, a driving circuit layer, an organic light-emitting device, an encapsulation layer and the like. The organic light-emitting device comprises an anode, a light-emitting material and a cathode which are arranged in sequence, wherein the anode is arranged close to a substrate, the thickness of the anode and the thickness of the cathode can be both 0.01 mu m, and the thickness of the light-emitting material can be 1.3 mu m; the encapsulation layer may include an organic encapsulation layer and an inorganic encapsulation layer sequentially disposed, the organic encapsulation layer being disposed adjacent to the base substrate, the organic encapsulation layer may have a thickness of 8 μm, which may be formed by an inkjet printing process (IJP); the thickness of the inorganic encapsulation layer may be 0.6 μm, and the material thereof may be silicon nitride or the like.

In another embodiment of the present disclosure, a touch module is further provided, as shown in fig. 7, 9 and 11, which includes a flexible circuit board 54 and the touch substrate described in any of the embodiments, wherein: the flexible circuit board 54 may have a plurality of pins 55, and optionally, the flexible circuit board 54 may be disposed at one side of the touch substrate, and particularly, the flexible circuit board may be disposed at one side of the touch substrate in the column direction Y, but is not limited thereto.

Each first touch electrode 510 in the touch substrate is electrically connected to a pin 55 through a lead 53; the plurality of sub-electrodes 511 sequentially connected via the wires 52 may be integrated and electrically connected to a lead 55 via a lead 53. It should be noted that, if the touch substrate includes the sub-electrode 511 that is not connected by the wire 52, the sub-electrode 511 can be electrically connected to a pin 55 of the flexible circuit board 54 through a lead 53. The flexible circuit board 54 can determine the touch position by detecting the capacitance change at each touch electrode during the touch time period.

In another embodiment of the present disclosure, a touch display device is further provided, which may include a display module and the touch module described above, where the touch module is disposed on one side of the display module. Optionally, the touch module may be disposed on a display side of the display module. The display module can be an OLED display or an LCD (liquid crystal display) display.

It should be noted that the specific type of the touch display device of this embodiment is not particularly limited, and any display device commonly used in the art may be used, specifically, for example, a liquid crystal display, an OLED display, a mobile device such as a mobile phone, a wearable device such as a watch, and the like.

It should be further noted that the touch display device includes other necessary components and components besides the display module and the touch module, for example, a liquid crystal display device, specifically, a housing, a main circuit board, a power line, and the like, which can be supplemented correspondingly according to specific requirements of the display device, and are not described herein again.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

A touch substrate, comprising: a substrate and a touch sensing layer disposed on the substrate, wherein,

the touch sensing layer comprises a plurality of touch electrode groups arranged in an array, and each touch electrode group comprises a first touch electrode and a second touch electrode which are arranged at intervals along a first direction and are insulated from each other;

the first touch electrodes in each touch electrode group are mutually insulated;

the second touch electrodes in each touch electrode group comprise a plurality of sub-electrodes which are arranged at intervals along a second direction and are insulated from each other, and the sub-electrodes of the second touch electrodes in at least two groups of touch electrode groups are connected in a one-to-one correspondence manner through conducting wires;

wherein the first direction and the second direction are perpendicular to each other.
The touch substrate of claim 1, wherein,

the first touch electrode, the second touch electrode and the lead are located on the same layer.
The touch substrate according to claim 1 or 2,

the number of the sub-electrodes of the second touch electrode in each touch electrode group is equal and is K; k is an integer greater than or equal to 2;

the ith sub-electrodes of the second touch electrodes in at least two groups of touch electrode groups are connected through a lead, i is more than or equal to 1 and less than or equal to K, and i is an integer.
The touch substrate of claim 3, wherein,

in the first direction, the touch electrode group is provided with M rows; in the second direction, the touch electrode group is provided with N rows; wherein N, M is an integer greater than or equal to 2;

an ith sub-electrode of a second touch electrode in the touch electrode group in the nth row and the mth column is connected with an ith sub-electrode of a second touch electrode in the touch electrode group in the (n + 1) th row and the (m + 1) th column through a lead; wherein N is more than or equal to 1 and less than N, M is more than or equal to 1 and less than M, and N and M are integers.
The touch substrate of claim 4,

the (n + 1) th row of touch electrode groups are arranged close to the flexible circuit board compared with the nth row of touch electrode groups;

in a direction from the nth row to the (n + 1) th row, sizes of the sub-electrodes of the second touch electrode in each touch electrode group in the first direction are sequentially reduced.
The touch substrate of claim 3, wherein,

in the first direction, the touch electrode group is provided with M rows; in the second direction, N rows are arranged on the touch electrode group; wherein N, M is an integer greater than or equal to 2;

the ith sub-electrode of the second touch electrode in the touch electrode group in the nth row and the mth column is connected with the ith sub-electrode of the second touch electrode in the touch electrode group in the (n + 1) th row and the mth column through a lead; wherein N is more than or equal to 1 and less than N, M is more than or equal to 1 and less than or equal to M, and N and M are integers.
The touch substrate of claim 6, wherein,

the (n + 1) th row of touch electrode groups are arranged close to the flexible circuit board compared with the nth row of touch electrode groups;

in a direction from the nth row to the (n + 1) th row, sizes of the first touch electrodes in the first direction are sequentially reduced.
The touch substrate of claim 3, wherein,

in the first direction, the touch electrode group is provided with M rows; in the second direction, N rows are arranged on the touch electrode group; wherein N is an integer greater than or equal to 2, and M is an integer greater than or equal to 3;

the ith sub-electrode of the second touch electrode in the touch electrode group in the (n + 1) th row and the (m-1) th column, the ith sub-electrode of the second touch electrode in the touch electrode group in the (n) th row and the (m) th column and the ith sub-electrode of the second touch electrode in the touch electrode group in the (n + 1) th row and the (m + 1) th column are connected through a lead; wherein N is more than or equal to 1 and less than N, M is more than or equal to 2 and less than or equal to M-1, and N and M are integers.
The touch substrate of claim 8,

in the 1 st row, the ith sub-electrode of the second touch electrode in the touch electrode group in the m-1 st column is connected with the ith sub-electrode of the second touch electrode in the touch electrode group in the m +1 st column through a lead;

wherein N is greater than or equal to 3 and M is greater than or equal to 4.
The touch substrate of claim 8 or 9, wherein,

in the Nth row, the ith sub-electrode of the second touch electrode in the touch electrode group in the mth column is connected with the ith sub-electrode of the second touch electrode in the touch electrode group in the (m + 2) th column through a lead;

wherein N is greater than or equal to 3 and M is greater than or equal to 4.
The touch substrate according to any one of claims 1 to 10,

a flexible circuit board is arranged on one side of the touch substrate in the second direction; in each touch electrode group, one end, close to the flexible circuit board, of the sub-electrode, closest to the flexible circuit board, of the second touch electrode is flush with one end, close to the flexible circuit board, of the first touch electrode; one end, far away from the flexible circuit board, of the sub-electrode farthest from the flexible circuit board is flush with one end, far away from the flexible circuit board, of the first touch electrode.
The touch substrate according to any one of claims 1 to 11,

in the second direction, the distance between the adjacent touch electrode groups is 6-300 μm;

in the first direction, the distance between the first touch electrode block and the second touch electrode block is 6-300 μm.
The touch substrate of any one of claims 1-12, wherein the first touch electrode and the second touch electrode are both self-contained touch electrodes.
The touch substrate of any one of claims 1-12, wherein the first touch electrode is a transmitter electrode and the second touch electrode is a receiver electrode.
A touch module, comprising:

a flexible wiring board having a plurality of pins;

the touch substrate of any one of claims 1 to 14, wherein each of the first touch electrodes is electrically connected to one of the leads through a lead; the plurality of sub-electrodes connected in sequence through the lead are taken as a whole and are electrically connected with the pin through a lead.
A touch display device, comprising a display module and the touch module of claim 15, wherein the touch module is disposed on one side of the display module.